US 12,276,013 B1
Corrosion-resistant oxide dispersion strengthened steel
Zhao Shen, Shanghai (CN); Yiheng Wu, Shanghai (CN); Xiaoqin Zeng, Shanghai (CN); Xujia Wang, Shanghai (CN); Ling Li, Shanghai (CN); and Yibin Tang, Shanghai (CN)
Assigned to SHANGHAI JIAOTONG UNIVERSITY, Shanghai (CN)
Filed by SHANGHAI JIAOTONG UNIVERSITY, Shanghai (CN)
Filed on Oct. 19, 2024, as Appl. No. 18/920,894.
Claims priority of application No. 202311380991.6 (CN), filed on Oct. 24, 2023.
Int. Cl. C22C 38/06 (2006.01); C22C 33/02 (2006.01); C22C 38/00 (2006.01); C22C 38/18 (2006.01)
CPC C22C 33/0228 (2013.01) [C22C 38/002 (2013.01); C22C 38/004 (2013.01); C22C 38/005 (2013.01); C22C 38/06 (2013.01); C22C 38/18 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An oxide dispersion strengthened steel, comprising in percentage by mass: Cr at 8.0 wt %-10.0 wt %, Al at 4.0 wt %-6.0 wt %, Ce at 0.2 wt %-0.8 wt %, Y at 0.2 wt %-0.4 wt %, O at 0.05 wt %-0.3 wt %, C at less than or equal to 0.00 16 wt %, and balance of Fe;
wherein a method for preparing the oxide dispersion strengthened steel comprises:
preparing materials comprising, in percentage by mass, Cr powder at 8.0 wt %-10.0 wt %, Al powder at 4.0 wt %-6.0 wt %, oxygen-containing Ce powder at 0.21 wt %-1.0 wt %, Y2O3 powder at 0.3 wt %-0.5 wt %, and balance of Fe powder, and making FeCrAl pre-alloyed powder by using the Cr powder, the Al powder and the Fe powder through gas atomization;
mixing the FeCrAl pre-alloyed powder with the oxygen-containing Ce powder and the Y2O3 powder, and performing ball milling on the mixed powder; and
sintering alloyed powder obtained after the ball milling, thereby obtaining the oxide dispersion strengthened steel;
wherein the ball milling is performed at a rotation speed of 220 rpm-350 rpm, a ball-to-powder ratio is 10:1-15:1, the ball milling is performed in an intermittent mode, a total working time is 36 h-64 h, the intermittent mode comprises stopping the ball milling for 15 min-60 min after every operation of 30 min-120 min, and the ball milling is performed under a gas pressure of 100 bar-1000 bar;
wherein the sintering adopts a step-wise sintering method, and comprises: under a pressure of 50 MPa-100 MPa, first raising a temperature to 700° C.-850° C. and keeping it for 5 min-10 min, then raising the temperature to 1000° C.-1200° C. and holding it for 5 min-10 min, thereafter lowering the temperature to a room temperature, and the temperature is raised and lowered both at a rate of 50° C./min-120° C./min; and
wherein an average particle size of the FeCrAl pre-alloyed powder is 1 μm-10 μm, and an average particle size of the Y2O3 powder is 50 nm-1 μm.